<template>
  <el-dialog title="附件上传" :visible.sync="visible" width="800" :close-on-click-modal="false" @close="cancel">
    <div>
      <el-upload :action='action' :before-upload="handleBeforeUpload" :show-file-list="true" :file-list='file' :http-request='customUpload' :limit='limit' :on-change='handleChange' :on-remove='handleRemove' class='upload-file-uploader' name='file' ref='upload' multiple :accept="accept" :on-error="handleUploadError" :on-exceed="handleExceed" :on-success="handleUploadSuccess" :headers="headers">
        <!-- 上传按钮 （trigger 触发文件选择框的内容）-->
        <el-button type="primary" slot="trigger" size="mini">选取文件</el-button>
        <!-- 上传提示 -->
        <div class="el-upload__tip" slot="tip" v-if="showTip">
          请上传
          <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b> </template>
          <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b> </template>
          的文件
        </div>
      </el-upload>
      <!-- 文件列表 -->
      <transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
        <li :key="file.uid" class="el-upload-list__item ele-upload-list__item-content" v-for="(file,index) in list">
          <el-link :href="file.url" :underline="false" target="_blank">
            <span class="el-icon-document">{{getFileName(file.name)}}}</span>
          </el-link>
          <div class="ele-upload-list__item-content-action">
            <el-link :underline="false" @click="handleDelete(index)" type="danger">删除</el-link>
          </div>
        </li>
      </transition-group>
    </div>
  </el-dialog>
</template>

<script>
import axios from "axios";
export default {
  name: "FileUpload",
  props: {
    //值
    value: [String, Object, Array],
    //数量限制
    limit: {
      type: Number,
      default: 5,
    },
    //大小限制（MB）
    fileSize: {
      type: Number,
      default: 5,
    },
    //文件类型，例如['png','jpeg','doc']
    fileType: {
      type: Array,
      default: () => [
        ".jpg",
        ".jpeg",
        ".png",
        ".doc",
        ".xls",
        ".xlsx",
        ".ppt",
        ".txt",
        ".pdf",
      ],
    },
    //是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
  },
  data() {
    return {
      // action: process.env.VUE_APP_BASE_URL + "/common/upload",
      action: "https://jsonplaceholder.typicode.com/posts/", //必选，上传的地址
      limit: 5, //一次最大允许上传个数
      file: [], //上传的文件列表
      visible: false, //是否显示文件上传弹窗
      accept: "", //可以上传的文件类型（accept字段需要在页面创建后，通过传入或默认的fileType字段进行拼接得到）
      // headers: {
      //   Authorization: "Bearer " + getToken(),
      // },
      // uploadList: [],
    };
  },
  methods: {
    //外部调用这个方法，用于显示文件上传弹窗
    show() {
      this.visible = true;
    },
    //上传文件之前的钩子，参数为上传的文件，若返回false或返回Promise且被reject，则停止运行
    //上传前检验格式或大小
    handleBeforeUpload(file) {
      //检验文件类型
      if (this.fileType) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf("."));
        }
        const isTypeOK = this.fileType.some((type) => {
          if (file.type.indxOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
        if (!isTypeOK) {
          this.$message.error(
            `文件格式不正确，请上传${this.fileType.join("/")}格式文件！`
          );
          return false;
        }
      }
      //检验文件大小
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$message.error(`上传文件大小不能超过${this.fileSize}MB!`);
          return false;
        }
      }
      return true;
    },
    //上传失败
    handleUploadError(err, file, fileList) {
      this.$message.error("上传失败，请重试");
    },
    //文件超出个数限制时
    handleExceed(files, fileList) {
      this.$message.error(`上传文件数量不能超过${this.limit}个`);
    },
    //文件上传成功时
    handleUploadSuccess(res, file, fileList) {
      if (res.code === 200) {
        this.uploadList.push({ name: res.fileName, url: res.fileName });
        this.$message.success("上传成功");
      } else {
        this.number--;
        this.$message.error(res.msg);
      }
      // this.cancel();
    },
    //文件状态改变时
    handleChange(file, fileList) {
      this.fileList = fileList;
      console.log("fileList文件改变", this.fileList);
    },
    //删除文件
    handleDelete(index) {
      this.fileList.splice(index, 1);
    },
    // 获取文件名称
    getFileName(name) {
      if (name.lastIndexOf("/") > -1) {
        return name.slice(name.lastIndexOf("/") + 1).toLowerCase();
      } else {
        return "";
      }
    },
    //关闭上传
    cancel() {
      this.fileList = [];
      this.visible = false;
    },
  },

  // computed: {
  //   //是否显示提示
  //   showTip() {
  //     return this.isShowTip && (this.fileType || this.fileSize);
  //   },
  // },

  // created() {
  //   this.fileList = this.list;
  //   //拼接
  //   this.fileType.forEach((el) => {
  //     this.accept += el;
  //     this.accept += ",";
  //   });
  //   this.fileType.slice(0, this.fileList.length - 2);
  // },

  // watch: {
  //   value: {
  //     handler(val) {
  //       if (val) {
  //         let temp = 1;
  //         // 首先将值转为数组
  //         const list = Array.isArray(val) ? val : this.value.split(",");
  //         // 然后将数组转为对象数组
  //         this.fileList = list.map((item) => {
  //           if (typeof item === "string") {
  //             item = { name: item, url: item };
  //           }
  //           item.uid = item.uid || new Date().getTime() + temp++;
  //           return item;
  //         });
  //       } else {
  //         this.fileList = [];
  //         return [];
  //       }
  //     },
  //     deep: true,
  //     immediate: true,
  //   },
  // },
};
</script>

<style  scoped>
.upload-file-uploader {
  margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}
.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
</style>
